Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Condition responsive means controls separating means
Patent
1980-08-06
1988-08-23
Reeves, Robert B.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Condition responsive means controls separating means
209587, 209694, B07C 500, B07C 536
Patent
active
047654899
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a separation wall movement control device applicable to different kinds of grain which give different responses to light in the grain sorting machines.
BACKGROUND ART
Conventional grain sorting machines have a rough grain sorting plate provided horizontally at the front and rear sides or with the front part raised and in a laterally sloped position. Sorting plates of this type are vibrated so as to shake up the grains at an average oscillation angle larger than the slope elevation angle. In other grain sorting machines air is blown through holes in the grain sorting plate without vibrating. In operation, a mixture of unhulled rice and unpolished rice is, for example, supplied onto said sorting plate, and different kinds of grain are collected at the front or rear side of said sorting plate, the different kinds of grains being separated by a separation wall provided beside said sorting plate. Finally, the grain is caused to flow out in a lateral direction. The distribution of grains on the sorting plate varies according to the amount and quality of mixed grain supplied. In addition, the greater the slop elevation angle of the sorting plate, the more the grain drifts to the rear part, and the greater the average oscillation angle, number of vibrations, or amplitude, the more the grain drifts to the front.
Accordingly, since the boundary of the different kinds of sorted grains e.g., unhulled rice, mixture of unhulled rice and unpolished rice, and unpolished rice, moves on the sorting plate, the separating wall for separating these different kinds of grains must be moved along an edge of the sorting plate.
As shown in Laying-open Pat. No. 51-47651, it has been the conventional practice to manually move the sorting wall along an edge of the sorting plate when the boundary of the different kinds of grains no longer coincides with the previous boundaries on the sorting plate, by observing the state of grain distribution on the sorting plate.
However, it is difficult to discern the boundary between unpolished grain and a mixture of unpolished grain and unhulled grain. If the boundary moves frequently, moving the separation wall is very troublesome. In particular, in the case of an oscillating type grain sorting machine, the machine must be stopped each time the separation wall is to be moved. Because of these disadvantages, work efficiency is very low.
DISCLOSURE OF INVENTION
An object of the present invention is to provide a grain sorting machine separation wall movement control device of high work efficiency characterized by highly accurate detection of the mixing ratio of the different kinds of grains giving different responses to light, the distribution status of the grain flowing through the grain exit passage of the grain sorting plate being automatically detected, and the separation wall being positioned to properly align with the boundary of the different kinds of grain according to the detection signal without use of the human hand.
In order to achieve the above-mentioned object, the present invention provides a separation wall movement control device for grain sorting machines wherein the separating wall is designed to move and stop along one side of the rough surface grain sorting plate, which is characterized by a separation wall having a detecting device consisting of many pairs of light sources and light receiving elements facing the grain exit passage of the rough grain sorting plate in the grain sorting machine, said separation wall being electrically connected with a driving unit and a detector via a control circuit.
Another object of the present invention is to provide a separation wall movement control device for grain sorting machines wherein light sources and light receiving elements are provided on each side of the grain exit passage.
Still another object of the present invention is to provide a separation wall movement control device for grain sorting machines wherein light sources and light receiving elements are provided on the same s
REFERENCES:
patent: 3807554 (1974-04-01), Satake
patent: 3933249 (1976-01-01), Welsh et al.
patent: 4301931 (1981-11-01), Satake
Reeves Robert B.
Satake Engineering Co. Ltd.
Wacyra Edward M.
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